The Canadian Meteor Orbit Radar: system overview and preliminary results

Jones, J.; Brown, Peter; Ellis, K. J.; Webster, A. R.; Campbell-Brown, M.; Krzemenski, Z.; Weryk, Robert

doi:10.1016/j.pss.2004.11.002

Cited by 120 publications

(96 citation statements)

References 10 publications

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“…This includes six all-sky video meteor cameras (Weryk et al 2007), CMOR (Jones et al 2005) and the four element infrasound station ELFO located in Elginfield, Ontario (43.1907°N, 81.3152°W, 322 m, Fig. 1).…”

Section: Equipment and Methodologymentioning

confidence: 99%

Infrasonic Observations of Meteoroids: Preliminary Results from a Coordinated Optical-radar-infrasound Observing Campaign

et al. 2007

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Recent observations using the newly installed Elginfield infrasound array in coordination with the Southern Ontario all-sky meteor camera network and Canadian Meteor Orbit Radar (CMOR) has shown that the number of meteors producing infrasound at the Earth's surface is more frequent than previously thought. These data show the flux of meteoroids capable of producing infrasound at the ground is at least 1/month and is limited to meteors with peak visual brightness above -2. Comparisons to current meteor infrasound theory show excellent agreement with amplitude and period predictions for weakly non-linear shock waves using a realistic vertically inhomogeneous atmosphere. Similar predictions show isothermal assumptions underestimate the amplitude by orders of magnitude.

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Section: Equipment and Methodologymentioning

confidence: 99%

Infrasonic Observations of Meteoroids: Preliminary Results from a Coordinated Optical-radar-infrasound Observing Campaign

et al. 2007

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“…These radars have proven to be a valuable tool to study meteor source radiants (e.g. Hocking et al, 2001;Campbell-Brown and Jones, 2006;Jones et al, 2005;Jones and Jones, 2006) and entry velocity and masses (e.g. Baggaley et al, 1994Baggaley et al, , 1997Brown et al, 1998;Hocking, 2000;Baggaley, 2002;Stober et al, 2011).…”

Section: Specular Radar Observationsmentioning

confidence: 99%

The Geminid meteor shower during the ECOMA sounding rocket campaign: specular and head echo radar observations

et al. 2013

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The ECOMA (Existence of Charge state Of meteoric smoke particles in the Middle Atmosphere) sounding rocket campaign was conducted during the Geminid meteor shower in December 2010 in order to explore whether there is a change of the properties of meteoric smoke particles due to the stream. In parallel to the rocket flights, three radars monitored the Geminid activity located at the launch site in Northern Norway and in Northern Germany to gain information about the meteor flux into the atmosphere. The results presented here are based on specular meteor radar observations measuring the radiant position, the velocity and the meteor flux into the atmosphere during the Geminids. Further, the MAARSY (Middle Atmosphere Alomar Radar System) radar was operated to conduct meteor head echo experiments. The interferometric capabilities of MAARSY permit measuring the meteor trajectories within the radar beam and to determine the source radiant and geocentric meteor velocity, as well as to compute the meteor orbit

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“…As a consistency check, we compare our fall time distribution to radar observations (Jones et al 2005) of meteoroids arriving at the top of Earth's atmosphere. Figure 9a shows that the fall time distribution obtained with our simulations is similar to the flux of radar-observed meteors when restricted to the same top-of-the-atmosphere speed range of 20 ≤ v imp ≤ 30 km/s (though other cuts yield similar results).…”

Section: Am/pm Asymmetrymentioning

confidence: 99%

Current bombardment of the Earth–Moon system: Emphasis on cratering asymmetries

Gallant

Gladman

Ćuk

2009

Icarus

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We calculate the current spatial distribution of projectile delivery to the Earth and Moon using numerical orbital dynamics simulations of candidate impactors drawn from a debiased Near-EarthObject (NEO) model. Surprisingly, we find that the average lunar impact velocity is 20 km/s, which has ramifications in converting observed crater densities to impactor size distributions. We determine that current crater production on the leading hemisphere of the Moon is 1.29 ± 0.01 that of the trailing when considering the ratio of craters within 30 • of the apex to those within 30 • of the antapex and that there is virtually no nearside-farside asymmetry. As expected, the degree of leading-trailing asymmetry increases when the Moon's orbital distance is decreased. We examine the latitude distribution of impactor sites and find that for both the Earth and Moon there is a small deficiency of time-averaged impact rates at the poles. The ratio between deliveries within 30 • of the pole to that of a 30 • band centered on the equator is nearly unity for Earth (< 1%)(0.992 ± 0.001) but detectably non-uniform for the Moon (∼ 10%) (0.912 ± 0.004). The terrestrial arrival results are examined to determine the degree of AM/PM asymmetry to compare with meteorite fall times (of which there seems to be a PM excess). Our results show that the impact flux of objects derived from the NEOs in the AM hours is ∼ 2 times that of the PM hemisphere, further supporting the assertion that meteorite-dropping objects are recent ejections from the main asteroid belt rather than young fragments of NEOs.

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The Canadian Meteor Orbit Radar: system overview and preliminary results

Cited by 120 publications

References 10 publications

Infrasonic Observations of Meteoroids: Preliminary Results from a Coordinated Optical-radar-infrasound Observing Campaign

Infrasonic Observations of Meteoroids: Preliminary Results from a Coordinated Optical-radar-infrasound Observing Campaign

The Geminid meteor shower during the ECOMA sounding rocket campaign: specular and head echo radar observations

Current bombardment of the Earth–Moon system: Emphasis on cratering asymmetries

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